Over-lapping screw ash remover



Nov. 7, 1933. H. c. CARTER El AL OVER LAPPING SCREW ASH REMOVER Filed May 5, 1930 2 Sheets-Sheet l M a o T- 1. R m a 1 4 BER 1 5 m2 TA a 3% 1 E 55 L, Am 1 l c v C w 27 TTU /v/s Nov. 7, 1933. H. c. CARTER ET AL OVER LAPPING SCREW ASH REMOVER Filed May 5, 1930 2 Sheets-Sheet 2 //\/Z/E/\/ TURS H. c. CARTER MAX c. RICHARDSON E IIIIIIIIII )4 TTUR/VE Patented Nov. 7, 1933 UNITED STATES PATENT OFFICE OVER-LAPPING SCREW ASH REMOVER Application May 5, 1930. Serial No. 449,761.

3 Claims. (o1.11o--1s5 This invention relates generally to coal burning devices, and particularly to ash removers therefor.

The main object of this invention is to provide a simple and efllcientform of ash remover by means of which incombustibles may be removed from an automatic coal burning device as theyare segregated by the process of combustion.

The second object is to produce an ash removing device which will be simple to manufacture, quiet in operation and without a tendency to become clogged with ordinary usage.

The third object is to combine a pair of screw conveyors for removing ashes from an underfeed l5 stoker in which the axes are approximately nor- 'mal to each other but in different planes and in- Figure 2 is a vertical section along the line 2-2 in Fig. 1.

Figure 3 is a section taken along the line 3-3 in Fig. 5.

Figure 4 is a section taken along the line 44 in Fig. 6.

Figure 5 is a section taken along the line 5-5 in Fig. 2.

Figure 6 is a section taken along the line 66 in Fig. 5.

Figure 7 is a section taken along the line 7-7 in Fig. 5.

Similar numbers of reference refer to similar parts throughout the several views.

Referring in detail to the drawings, inorder to illustrate, this invention there is shown an underfeed stoker including a tuyere section 10 having an upright wall 11 forming a flattened side for the otherwise circular tuyere element which is surrounded by and spaced from a grinding ring 12. In the space between the tuyere 10 and the ring 12 is mounted a breaker bar 13 which travels around the tuyere with the ring 12, the details of which are described in application Serial Number 446,207. Rotation is supplied to the ring 12 by means of an internal gear 14 which is attached to the ring 12 and which meshes with a pinion 15 which is mounted on the shaft 16 whose lower end journals in the housing 17, one side of which is secured to a support 18 and the other side of which is provided with a hub 19 in which journals the shaft 20 of a bevel gear 21, which meshes with a similar gear 22 on the shaft 16. The shaft20 is provided with a square shank 23.

Forming a part of the stoker is a stoker motor 24 which operates a blower 25 which communicates by means of the air duct 26 with the tuyere section 10. The motor 24, through a reduction gearing contained within the casing 27, drives a fuel feed screw 28 which receives fuel from the hopper .29 and conveys same through the fuel feed duct 30 to the retort 31 from which it is forced upwardly past the tuyere element 10.

Turning now to the present invention sameincludes a horizontal tube 32 within which is rotatably placeda conveyor screw 33 one end of which is provided with a socket 34 which engages the shank 23. The opposite end of the screw 33 is provided with a socket 35 which receives the square end of a shaft 36'which journals in the 30 housing 3'? and is joined by means of a coupling 38 to the end of a stub shaft 39 which is driven by a gear 40 which, in turn, meshes with the gear 41 on the drive shaft of the. fuel feed screw 28. The gears 40 and 41 are contained within a 35 shiftable casing 42. a

-On the shaft 36 within the housing 37 is secured a bevel gear 43. The gear 43 meshes with a gear 44 which also journals in the housing 37 and drives the square shaft 45. The housing 37 is integral with the transfer section 46 which is provided with an outlet 47. The transfer section 46 receives the end of the conveyor tube 32 and its outlet portion 47 receives the tube 48 whose axis is inclined and lies in a plane below a parallel 9; plane passing through the axis of the horizontal screw 33, first mentioned.

Within the tube 48 is placed a second conveyor screw 49 whose intake end 50 is below and at one end of the screw 33. The upper end 51 of the screw 49 journals in a gear case 52 which is secured to' the upper end of the tube 48 and contains a pair of meshing spur gears 53 and 54, the former of which is secured on the screw end 51 and the latter is secured ona stub shaft 55 on whose projecting end is secured a coupling 56 which receives the upper end of "the square shaft 45. The tube 48 is provided with an outlet spout 5'7 through which ashes can be discharged into the can 58.

It will be noted from this construction that the ashes from the horizontal screw fall upon the lower end of the inclined screw, which is driven from its outermost end in a somewhat roundabout manner for the purpose of avoiding the subjection of the driving parts to the abrasive action of the ashes.

By this arrangement it is practically impossible to congest the materials around the point of transfer from one screw to the other, as long as the outlet spout 57 is left free.

There is illustrated in the drawings a fuel bed 59 from which incombustibles 60 pass over through the space between the tuyere section 10 and the ring 12. The tube 32 communicates with the space inside the ring 12 by means of an inlet' box 61.

We claim:

1. An ash remover for underfeed stokers consisting of grinding means for reducing the size of incornbustibles, a horizontal screw conveyor having its inlet under said grinding means, an inclined screw conveyor having its axis approximately normal to the axis of said horizontal conveyor in an offset plane passing parallel to and under the axis of said horizontal conveyor, a

drive shaft extending into said horizontal conveyor, and driving means extending from said drive shaft along the outside of said inclined conveyor and into the upper end thereof for the purpose of providing rotation to the screw of said inclined conveyor.

2. In a furnace the combination of a tuyere section through which coal is fed upwardly,

means for breaking clinkers projecting beyond the sides of said tuyere section, a grinding ring for reducing said clinkers to a size adaptable to conveying by means of a screw conveyor, a hori zontal screw conveyor mounted under said grinding ring having a driving connection thereto whereby said grinding ring may be rotatedfan inclined screw conveyor rising laterally from the under side of said horizontal conveyor and communicating therewith, a drive shaft extending along the axis of said horizontal conveyor at its discharge end, and driving connections from said drive shaft on the outside of said inclined conveyor for rotating its screw from its discharge end.

3. In a furnace the combination of a retort, a circular tuyre section mounted on said retort, a grinding ring rotatably mounted around and spaced from said tuyre section, a floor beneath the space upon which ground incombustibles may be deposited, said floor having an opening formed therein, a horizontal screw conveyor having its inlet end communicating with said opening, the screw of said conveyor having operating connections to said grinding ring, an inclined elevating screw conveyor having its lowermost end approximately tangential to the under side of said horizontal conveyor at its discharge end, and means for driving the screws of said conveyors, said driving connections lying entirely outside of the ash containing portions of said conveyors.

HASKELL C. CARTER. MAX C. RICHARDSON. 

